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Suppose that the service life, in years, of a hearing aid battery is a random variable having a Weibull distribution with a = 1/2 and ß = 2.
(a) How long can such a battery be expected to last?
(b) What is the probability that such a battery will be operating after 2 years?
A slot machine in Reno costs $1 to play. If the jackpot is $1,000 and the expected value is $ - 0.50 find the probability of winning.
Explain why we need to use the t distribution. What assumption do you need to make?
Based on the custom "rule-of-thumb" for estimating the standard deviation, if the range of prices for a product sold in Kansas City is between $99 and $349, an estimate of the standard deviation of the prices would be about:
4 7 7 5 2 9 7 6 8 5 8 4 1 5 2 8 7 6 6 9. (a) Determine three quartiles and (b) draw box-and-whisker plot of the data.
Evaluate the union's claim. Include the hypotheses (both null and alternate), alpha, test statistic (highlight where it is calculated on your spreadsheet), decision, conclusion.
A data set comprises of set of numerical values. Which, if any, of the following statements could be right? Point to whether given statement could apply to data set consisting of 1,000 values which are all different.
refer to the following frequency distribution for questions 1 2 3 and 4.the frequency distribution below shows the
consider the hypothesis test given byh0 mu 530h1 mu ne 530in a random sample of 85 subjects the sample mean is found
For each of the following sampling scenarios, determine which test statistic is appropriate to use when making inference statements about the population mean.
One group is given the new drug and the other group is given the standard drug. Data are recorded on the effects of each drug. Is the research division using dependent or independent samples? Why?
A firm plans to hire 100 employees during the year. It expects that 25 of these employees will obtain graduate degrees within the next 5 years of being hired.
Evaluate this correlation. What does this correlation tell us about the relationship between these two instruments?
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